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From previous post:
3) Air intake hoses from turbo outlet to intercooler inlet, and from intercooler outlet to intake manifold. Oil can cause these to deteriorate, creating a leak. The leak allows pressure to bleed off.
This is a common problem. Oil gets into the air intake hoses downstream of the turbo. (can be a product of bad seals in the turbo and/or crankcase fumes if the Positive Crankcase Ventilation system is plugged). The oil collects and pools in the hoses and deteriorates the rubber -- causing a leak.
The best way to diagnose this (or rule it out) is to remove the hoses and inspect them for soft spots and leaks. When you have them off, it's good practice to clean them with dishsoap or a mild degreaser. (In fact, this ritual should be considered scheduled maintenance since SOME oil build-up is normal even under ideal conditions. It will ensure that your hoses last a long time.) If you're intimidated by the thought of removing all the intake hoses, then just remove one at a time. Once you do the procedure the first time, you'll realize that it really is very simple.
Good luck... and post back with what you find. We'll get this figured out!
Jeff Pierce
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'93 945 Turbo ( one kickass family car ! ), '92 Mercedes 190E (my daily driver), '53 Willys-Overland Pickup (my snow-plow truck/conversation piece -- sold to a loving home), '85 Jeep CJ-7 w/ Fisher plow
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